Understand that when you're sending your coins to an exchange, you're subjected to their convenience, as to when you will get those coins back. This doesn't have to do with the dignity of the people who work there, more than the ability of -even one- person to steal a fraction (or whole) of these coins. FWIW: I'd fully entrust my coins on an exchange that has EVERY transaction on the ledger. All the others are potentially harmful (and, yes, I do trade at the moment knowing all this). So, you either accept the risk or not. Same rules apply for everyone and every exchange out there.